<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
<input type="text" placeholder="请输入0-100之间的整数" id="i1">
<input type="button" value="猜一猜" onclick="f()">
<div>结果:<span></span></div>

<script>
  //得到0-100随机整数
  let x = parseInt(Math.random()*101);
  let c = 0;
  function f(){
    c++;
    let i1 = document.querySelector("#i1");
    let s = document.querySelector("span");
    if(isNaN(i1.value)){
      s.innerText="输入有误!";
      return;
    }
    if(i1.value > x){
      s.innerText="猜大了!";
    }else if(i1.value < x){
      s.innerText="猜小了!";
    }else{
      s.innerText="恭喜你第"+c+"次猜对了!"
      //直接进入下一局
      //关键数据: 次数清零 生成新的随机数
      c=0;
      x = parseInt(Math.random()*10);
    }

  }
</script>
</body>
</html>